How to cancel an external axis

which controller is it? and which robot ware?

just create a new system in robot studio and delete the option you don't want to use.

Quote from fabioandretto

Is it possible to do it through the parameters in configuration? Basically to allow the robot work without the motor of one external axis.

Yes it is possible. As I understand your question, correct me if I am wrong, you want the axis permanently removed? If so, you will also need to jumper the ptc connection, x22 or x23, something like that. Study up on it in the electrical schematics. Search the manuals section here.

Delete the mechanical unit and anything that references it.

If it's an ABB supplied positioner the ext. axis is booted into the system with some parameters as "hidden" so deleting what you can will most likely cause a sysfail.

Easiest as Reboot mentions is to create a new system without the external axis (option) and reboot the robot with the new system. At that point you can remove the external axis without an resolver error, however, you will most likely get the PTC / overtemp error in which case you need to jumper the PTC signal that used to go to the external axis.